GoogleApiServiceClientInterface getAuthConfig & getAccessToken return type mixed

Problem/Motivation

Interface raises a warning in higher phpstan levels. Json::decode would return mixed.

GoogleApiServiceClientInterface

  /**
   * Function returns Json file of the account.
   *
   * @return string
   *   Returns the JSON.
   */
  public function getAuthConfig();

GoogleApiServiceClient

  /**
   * {@inheritdoc}
   */
  public function getAuthConfig() {
    return Json::decode($this->auth_config);
  }

Proposed resolution

Update interface return and docblock to mixed.

  /**
   * Function returns Json of auth_config.
   *
   * @return mixed
   *   Returns the auth config.
   */
  public function getAuthConfig();

  /**
   * Function returns Json of access_token.
   *
   * @return mixed
   *   Returns the access token.
   */
  public function getAccessToken();

Remaining tasks

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User interface changes

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API changes

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Data model changes

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